3640664 has 16 divisors (see below), whose sum is σ = 6848520. Its totient is φ = 1814400.

The previous prime is 3640661. The next prime is 3640697. The reversal of 3640664 is 4660463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2939 + ... + 3989.

Almost surely, 2^3640664 is an apocalyptic number.

It is an amenable number.

3640664 is a deficient number, since it is larger than the sum of its proper divisors (3207856).

3640664 is a wasteful number, since it uses less digits than its factorization.

3640664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490 (or 1486 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 3640664 is about 1908.0524101816. The cubic root of 3640664 is about 153.8367866604.

The spelling of 3640664 in words is "three million, six hundred forty thousand, six hundred sixty-four".